Zero-Waste Vegetable Stock

Ingredients

Equipment Needed

• •Large stockpot (6-quart minimum)
• •Fine-mesh strainer
• •Gallon freezer bags for collecting scraps
• •Glass jars or freezer-safe containers for storage

Instructions

1. 1

   Collect your scraps

   Keep a gallon freezer bag in your freezer. Every time you trim an onion, peel a carrot, or strip parsley leaves from stems, toss the scraps into the bag. Within a week or two of regular cooking, you'll have enough for stock. This is the foundation of zero-waste cooking, the practice of treating trimmings as ingredients rather than garbage.

   Good scraps include onion skins and ends, carrot tops and peels, celery leaves and hearts, leek tops, scallion roots, fennel fronds, mushroom stems, corn cobs, and any fresh herb stems. Avoid brassicas like cabbage, broccoli, or Brussels sprouts, which turn bitter and sulfurous.
2. 2

   Prepare for simmering

   Dump your frozen scraps into a large stockpot. There's no need to thaw them. Add the halved garlic head, peppercorns, bay leaves, thyme, and parsley. Pour the cold water over everything. The scraps should be submerged with an inch or two of water above them.

3. 3

   Bring to a gentle simmer

   Set the pot over medium-high heat and bring slowly to a simmer. Watch for the first lazy bubbles breaking the surface. The moment you see a proper simmer, reduce the heat until only occasional bubbles rise. A rolling boil extracts harsh flavors from vegetable skins and makes muddy stock. Patience here pays dividends.

   Cold water start matters. It allows gentle extraction of flavors rather than shocking the vegetables into releasing bitter compounds.
4. 4

   Simmer until fragrant

   Let the stock simmer uncovered for 45 minutes to one hour. Your kitchen will fill with a clean, vegetal perfume. The liquid will turn golden, somewhere between pale straw and amber depending on your onion skin ratio. Taste it after 45 minutes. When it tastes like something you'd want in your soup, it's ready. More time won't improve it and may turn it bitter.

5. 5

   Season and strain

   Add one teaspoon of salt and stir to dissolve. The salt should enhance, not dominate. Set a fine-mesh strainer over a large bowl or another pot. Pour the stock through in batches, pressing gently on the solids with the back of a ladle to extract every drop of liquid. Discard the spent vegetables to your compost.

6. 6

   Cool and store

   Let the stock cool to room temperature before transferring to storage containers. Glass jars work beautifully. Leave an inch of headspace if freezing to allow for expansion. Label with the date. Refrigerated stock keeps five days. Frozen stock keeps six months and maintains its quality throughout.

   For easy freezing, pour cooled stock into ice cube trays. Once frozen, transfer cubes to a freezer bag. Each cube is roughly two tablespoons, perfect for deglazing a pan or boosting a quick sauce.

Chef Tips

• •Balance your scraps. Aim for roughly equal parts onion family, carrot family, and celery family. Too much of any single vegetable dominates the flavor.
• •Mushroom stems add tremendous depth. Save them whenever you're cooking with mushrooms. Even dried mushroom soaking liquid can go into the pot.
• •Corn cobs in summer make stock subtly sweet and silky. Two cobs per batch is plenty.
• •Tomato scraps add acidity and color but use them sparingly, no more than one cup per batch, or they'll overwhelm.
• •Avoid beets unless you want pink stock. Avoid peppers and their seeds, which can turn bitter. Avoid anything moldy or truly past its prime.

Advance Preparation

• •Vegetable scraps can be collected in the freezer for up to two months before making stock.
• •Finished stock keeps refrigerated for five days or frozen for six months.
• •Freeze stock in ice cube trays for portion-controlled additions to pan sauces and quick weeknight cooking.

Frequently Asked Questions

Nutrition Information

1 serving (about 240g)